First to answer correct will be the baranist .the ratio of students who wear spectacles is 2:5. 1.what is the ratio of students who wear speactacles and those who dont.
2.if there are 15 students who dont wear speactacles ,how many students wear speactacles in the class.
3.how many students are there in class

1) Who wear: 2:5

Whi don't wear: 3:5

2) 10 don't wear spectacles

3) 25

Hope it helps!!!

If these were the given choices:
a.) according to the line of best fit, the object would have hit the ground 0.6 seconds later than the actual time the object hit the ground.

b.) according to the line of best fit, the object was dropped from a lower height.

c.)the line of best fit correctly predicts that the object reaches a height of 40 meters after 3.5 seconds.

d.) the line of best fit predicts a height of 4 meters greater than the actual height for any time given in the table.

my answer is:  
c.)the line of best fit correctly predicts that the object reaches a height of 40 meters after 3.5 seconds.

pls. see attachment.